chore: add mergify, dependabot, and CI gate configuration#2

jd merged 1 commit intomainMergifyio/alembic-git-revisions:mainfrom

devs/jd/add-mergify-config/Icdedb5d76ebfc385081f201467d8646303fd2f0fMergifyio/alembic-git-revisions:devs/jd/add-mergify-config/Icdedb5d76ebfc385081f201467d8646303fd2f0fCopy head branch name to clipboard